Services Details
The wastewater on a ship consists of various streams, which mix, together in proportion of the production throughout the day. The variations in flow and mixture over a 24-hour period are significant.
The Waste Water System is designed to treat the following types of water:
- Galley water / Pulper water
- Accommodation water
- Laundry water
- Sewage black water
The water constituents can be classified as proteins, fats and grease, urea, detergents, sand, chemicals and microorganisms (bacteria and viruses). These components can be grouped into four major categories:
- Particulates
- Biodegradable organic matter
- Nutrients
- Microorganisms
In order to comply with the discharge standards & regulations, an advanced wastewater treatment plant must treat all four categories of the components.
An advanced, automated, multiple-step treatment process for treatment of waste water onboard ships. The Waste Water System consists of five basic treatment steps or modules as follows:
1) Pre-treatment module:
- Black water tank
The black water holding tank collect all the black water from the ship being transferred form vacuum collecting tanks for further processing in the waste water system (AWP).
- Grey Water Tanks and GW System Management
– Accommodation and Galley gray water management.
The ship generated gray water included galley water is received in six ship collecting tanks DGT31, DGT32, DGT33, DGT34, DGT35 and DGT36. The wastewater is further transferred directly to the mixing tank on demand. The ship existing automation controls the level of all collecting tanks and empties them in batches through the line PR050 to the AWP mixing tank.
– Laundry gray water storage and management.
Laundry gray water is received in designated Laundry tanks TK2112 and TK2212. In normal operation only one tank is in use.
2) Biological module:
This module is a biological system for removal of biodegradable organic matter. Here, organic matter is utilized by bacteria for growth and energy, resulting in conversion of organic matter from water phase to bio mass and CO2.
The biological module consists of:
- Moving Bed Biofilm Reactor (MBBR)
- Antifoam dosing unit
3) Flotation module:
This is a chemical treatment system for nutrient removal (phosphorus and nitrogen) and color. Here, dissolved components react with polymer to form particles and bio residue, which can be removed subsequently.
The Flotation module consists of:
- Polymer dosing unit
- Flocculation unit
- Flotation unit
- Dispersion unit
The flotation module is the main separation step in the wastewater treatment plant. The separations step contains a chemical process with flocculation with polymer as flocculent. This chemical precipitation makes larger particles to be removed from the wastewater.
4) UV module:
The UV module function is to neutralize and disinfect remaining bacteria in the clean effluent using ultra violet (UV) light.
The UV module consists of:
- UV disinfection unit
- UV wash unit
- TSS unit